Thetford Aqua Rinse Toilet Flush Tank Additive - 1.5 Litre, A lavender scented toilet fluid for daily use. Aqua Rinse keeps the water fresh, but primarily it ensures a smoother, better flush. Aqua Rinse leaves a micro-thin protective film in the toilet bowl and prevents hard water stains. Its lubricating qualities also assist operation by allowing easier opening and closing of the blade. Aqua Rinse generally improves the hygiene of the toilet and leaves a pleasant lavender smell after flushing.